Astronomy and Astrophysics Forum

Post thread
Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Undergrad Question about the fabric of space
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Evidence of Dark Matter? 130-GeV gamma rays from near our galaxy's core
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Distance of planets from stars and revolution
  • · Replies 20 ·
Replies
20
Views
6K
Undergrad Could the Milky Way's Dense Oort Cloud Mean a Richer Galactic Landscape?
  • · Replies 40 ·
2
Replies
40
Views
10K
Graduate Time Space Physics: 3 Questions for Physics Community
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad The atmosphere of titan and mars
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Light from Big Bang: 14 Billion Years Old and Counting
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Perlmutter & Supernovae: Debunking the Myth of Accelerating Galaxies
  • · Replies 88 ·
3
Replies
88
Views
21K
Graduate How Does Math Point to Various Theories in Physics?
  • · Replies 20 ·
Replies
20
Views
6K
Graduate Dark Matter: Light or Misunderstood?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Is Moon so crucial for axial tilt stability of the planet?
  • · Replies 15 ·
Replies
15
Views
7K
Graduate Is it possible that speed of a gravitational waves are greater than c?
  • · Replies 52 ·
2
Replies
52
Views
12K
Graduate Question regarding dark energy and accelerated expansion
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Supernova Shockwave: Finite or Energy?
  • · Replies 6 ·
Replies
6
Views
4K
Whats is volume of mass at the centre of the sun
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Black Holes as 2 Dimensional Objects
  • · Replies 32 ·
2
Replies
32
Views
9K
High School We're no longer biggest star system
  • · Replies 23 ·
Replies
23
Views
6K
High School Do we know whats at the center of galaxies yet?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate What would it take to terraform Pluto and Charon?
  • · Replies 21 ·
Replies
21
Views
12K
Graduate Star Cluster Within Self Schwarzschild Radius
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Does dark matter have to be one particle
  • · Replies 8 ·
Replies
8
Views
4K
High School Can the Venus transit be viewed with the naked eye
  • · Replies 4 ·
Replies
4
Views
5K
Undergrad What Does the Solar Spectrum Look Like at Night?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate On Introducing a Nano-Planet into an Existing Solar System
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Galaxies moving faster than the speed of light?
  • · Replies 12 ·
Replies
12
Views
8K
Graduate Subtracting the proper motion resulting from movement of the Sun
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Black hole acreting binary -magnetic fields
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Why The Gamma Ray Burst doesn't explode into all the directions?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Hubble's Law and it's relation to Quantum Mechanics
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Spinning Magnets in Space: Physics & Hydro Generator
  • · Replies 12 ·
Replies
12
Views
4K
Undergrad Is the process of fusion really enough to keep stars from imploding?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Mathematical Solar Model: Core, Radiative Zone, and Convective Zone
  • · Replies 23 ·
Replies
23
Views
11K
Undergrad What happens to shrapnel if a hand grenade explodes in solar orbit?
  • · Replies 19 ·
Replies
19
Views
5K
Graduate Series Expansion Newton Dark Matter
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Vc versus Vcc. Meteor Calculations
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Did the Milky Way Have a Galactic Collision in the Past?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Unifying Dark Energy & Dark Matter: Investigating the Chaplygin Gas
  • · Replies 2 ·
Replies
2
Views
2K
High School Percent area of the universe is galaxy?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Hubble Law - recession velcoity?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Half Question/Half-Challenge: Dimensions of of the Earth-Moon System
  • · Replies 3 ·
Replies
3
Views
4K
High School Gravity another question from a bus driver
  • · Replies 2 ·
Replies
2
Views
2K
High School Gravity a question from a bus driver:-)
  • · Replies 24 ·
Replies
24
Views
6K
Graduate Why Measure Velocity Dispersion in Elliptical Galaxies?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Questions about Universe expansion
  • · Replies 6 ·
Replies
6
Views
3K
High School Earth's magnetosphere historical data
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Dark Matter, any new news about it?
  • · Replies 5 ·
Replies
5
Views
4K
High School How much would a laser spread out in space?
  • · Replies 4 ·
Replies
4
Views
5K
Undergrad Which is Brighter: Gamma Ray Bursters or Quasars?
  • · Replies 4 ·
Replies
4
Views
7K
Undergrad Our weight if the earth spins faster
  • · Replies 11 ·
Replies
11
Views
24K
Graduate Nuetron Star Binary: Acretion Process Differences
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Will a Knotted Flux Tube in a Plasma Tend to Move?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Solar wind interaction with Earth's magnetic field
  • · Replies 3 ·
Replies
3
Views
10K
Graduate Hypothesis: Tugging from the Sun to Earth Faster than Light?
  • · Replies 12 ·
Replies
12
Views
5K
Graduate Why can't dark matter simply be ripples in spacetime?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate How WMAP satellite surveyed all over observable universe
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Trying to understand basic gravitation
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Why do people think red shift is caused by big bang?
  • · Replies 20 ·
Replies
20
Views
6K
Graduate Is there any gravitationally unbound' galactic clusters in observable universe
  • · Replies 4 ·
Replies
4
Views
4K
High School Solar Flare & CME: August 9, 2011 X6.9 Flare
  • · Replies 26 ·
Replies
26
Views
12K
High School What conditions must be met before star becomes a black hole?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Dark Matter Galaxy Collision Galactic Double Slit Test
  • · Replies 4 ·
Replies
4
Views
3K
Stargazing What is a good aperture for a telescope collecting ISO far-infrared radiation?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Define Red-Shift: Explaining BH Event Horizon
  • · Replies 3 ·
Replies
3
Views
3K
Graduate How do physicists use redshift to determine the expansion of the universe?
  • · Replies 33 ·
2
Replies
33
Views
7K
High School What do the stars look like from space?
  • · Replies 12 ·
Replies
12
Views
21K
High School Are there other periodic phenomena's other than the comet Hally?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Matter at the core of a neutron star.
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Is matter not expanding together with the rest of the universe?
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Type 2 Supernova: Energy Source & Type 1 Comparison
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Frame Dragging Explained: Dimensions, Schwarzschild Radius, Metrics & Angles
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Black holes and the event horizon
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Position and velocity vector of point referred to equinox
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why Does 'a' Being Smaller Than 'a0' Eliminate μ in MOND?
  • · Replies 31 ·
2
Replies
31
Views
8K
Graduate Practical Interstellar Mission to Alpha Centauri?
  • · Replies 23 ·
Replies
23
Views
9K
Graduate All things aside, how big could a black hole actually get?
  • · Replies 27 ·
Replies
27
Views
6K
Graduate Looking for advice on solar system integrator
  • · Replies 3 ·
Replies
3
Views
4K
Graduate How all matter antimatter particles annihilated after bigbang
  • · Replies 28 ·
Replies
28
Views
7K
Undergrad A question regarding the B-V measurements of stars
  • · Replies 1 ·
Replies
1
Views
2K
Does Matter's Mass Determine Space's Curvature?
  • · Replies 11 ·
Replies
11
Views
8K
Undergrad Source of Hydrogen: Where Does Our Sun Get Its Fuel?
  • · Replies 5 ·
Replies
5
Views
3K
High School What Would Happen if Earth Had Two Moons?
  • · Replies 22 ·
Replies
22
Views
42K
Undergrad What is the Event Horizon of a Black Hole?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Are Charged Black Holes Just a Myth?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Understanding Stellar Lifespans: Comparing Luminosity & Mass
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Why is the moon's gravity differential field pointing away from the
  • · Replies 1 ·
Replies
1
Views
3K
White Dwarf, 12 Billion Years Old, Found Only 100LY Away
  • · Replies 18 ·
Replies
18
Views
7K
Graduate Gravitational Perturbation - How does it work?
  • · Replies 2 ·
Replies
2
Views
3K
Can Ordinary Telescopes Detect Moon Bases?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Accretion disk around galaxy NGC 4261
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Could SF6, Photosynthetic Bacteria, Hydrogen, and Ozone Make Mars Habitable?
  • · Replies 15 ·
Replies
15
Views
6K
Could Life Adapt to the Solar Flares of Red Dwarf Stars?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Layman question about distance and speed of light
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Index of Refraction of Outer/Interplanetary Space
  • · Replies 2 ·
Replies
2
Views
7K
High School Asteroid hits moon → moon hits Earth possible?
  • · Replies 68 ·
3
Replies
68
Views
83K
High School Asteroid, Meteorite, Meteoroid, or Meteor?
  • · Replies 11 ·
Replies
11
Views
6K
Graduate Pauli Exclusion Principle in Black Holes.
  • · Replies 11 ·
Replies
11
Views
9K
Graduate What does a more massive neutron star constitute?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate How Can Space Exist Without Time?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Gravitational waves in elsewhere of light cone
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Solar elements and their placement
  • · Replies 4 ·
Replies
4
Views
2K